Take a look at cards like Anim Pakal, Thousandth Moon and Urabrasks Forge for some consistent engines to use with him
Most decks will require 3-5 Lands to get going as plenty of Commanders fall within this cost range
From 2021s Adventures in the Forgotten Realms on, cards that require you to roll a d20 have been printed in black border, and thus the mechanic became legal for a time in Standard as well as in Eternal formats
You can cast that card or put it into your hand, whichever you like

Abolisher of Bloodlines Adanto, the First Fort Ashling, Rekindled Ashling, Rimebound Assimilate Essence Atzal, Cave of Eternity Avacyn, the Purifier Awoken Horror Azcanta, the Sunken Ruin Barracks of the Thousand Black Chocobo Blight Titan Blighted Burgeoning Blightsower Thallid Bloated Processor Brigid, Clachan's Heart Brimaz, Blight of Oreskos Brutal Cathar Chrome Host Seedshark Compleated Conjurer Compleated Huntmaster Conqueror's Foothold Converter Beast Corruption of Towashi Cult of the Waxing Moon Curse of Leeches Deadly Dancer Demon-Possessed Witch Elvish Vatkeeper Essence of Orthodoxy Excise the Imperfect Eyes of Gitaxias Furnace Gremlin Geode Grotto Gift of Compleation Glissa, Herald of Predation Glistening Dawn Gold-Forge Garrison Grub, Storied Matriarch Hideous Fleshwheeler Huntmaster of the Fells Ichor Drinker Infected Defector Injector Crocodile Itlimoc, Cradle of the Sun Jurassic Park Lost Vale Lunarch Inquisitors Malady Invoker Marauding Dreadship Merciless Repurposing Metzali, Tower of Triumph Mycoid Maze Neglected Heirloom Norn's Inquisitor Olag, Ludevic's Hubris Phyrexian Awakening Primal Wellspring Progenitor Exarch Ravager of the Fells Revealing Eye Sanctum of the Sun Sculpted Perfection Searing Barb Sephiroth, One-Winged Angel Shadows' Lair Shinryu, Transcendent Rival Skyclave Invader Spires of Orazca Spitfire Bastion Sunder the Gateway Sunfall
